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The Lyn-Tron Metric Round Thumb Nut is precision-engineered in the USA to deliver reliable hand-tightening for a variety of applications. Designed with a knurled, easy-grip surface, this nut allows for tool-free installation and removal, making it ideal for equipment panels, enclosures, and assemblies requiring frequent access or adjustment.

Manufactured under the trusted Lyn-Tron brand, this thumb nut features high-quality materials and tight tolerances to ensure strength, durability, and a clean fit on metric-threaded components. Whether used in electronics, industrial machinery, or prototyping, it provides a dependable fastening solution with a professional finish.

As part of OneMonroe’s extensive line of fasteners and precision hardware, the Lyn-Tron Metric Round Thumb Nut reflects our commitment to American-made quality and engineering excellence.

plain-thumb-screw_large
Unit of Measure
1 

Item #

Material

OD

Head Diameter

Washer Dia

Female Thread

Quantity
BR5560-00 N/A Brass N/A 6 mm N/A 6 mm N/A 5 mm N/A M2.5x0.45
BR5561-00 N/A Brass N/A 8 mm N/A 8 mm N/A 6 mm N/A M3X0.5
BR5562-00 N/A Brass N/A 10 mm N/A 10 mm N/A 9 mm N/A M3.5x0.6
BR5563-00 N/A Brass N/A 10 mm N/A 10 mm N/A 9 mm N/A M4X0.7
BR5564-00 N/A Brass N/A 13 mm N/A 13 mm N/A 11 mm N/A M5X0.8
BR5565-00 N/A Brass N/A 13 mm N/A 13 mm N/A 12 mm N/A M6X1
BR5566-00 N/A Brass N/A 19 mm N/A 19 mm N/A 16 mm N/A M8X1.25
SS5560-00 N/A Stainless Steel N/A 6 mm N/A 6 mm N/A 5 mm N/A M2.5x0.45
SS5561-00 N/A Stainless Steel N/A 8 mm N/A 8 mm N/A 6 mm N/A M3X0.5
SS5562-00 N/A Stainless Steel N/A 10 mm N/A 10 mm N/A 9 mm N/A M3.5x0.6
SS5563-00 N/A Stainless Steel N/A 10 mm N/A 10 mm N/A 9 mm N/A M4X0.7
SS5564-00 N/A Stainless Steel N/A 13 mm N/A 13 mm N/A 11 mm N/A M5X0.8
SS5565-00 N/A Stainless Steel N/A 13 mm N/A 13 mm N/A 12 mm N/A M6X1
SS5566-00 N/A Stainless Steel N/A 19 mm N/A 19 mm N/A 16 mm N/A M8X1.25
ST5560-00 N/A Steel N/A 6 mm N/A 6 mm N/A 5 mm N/A M2.5x0.45
ST5561-00 N/A Steel N/A 8 mm N/A 8 mm N/A 6 mm N/A M3X0.5
ST5562-00 N/A Steel N/A 10 mm N/A 10 mm N/A 9 mm N/A M3.5x0.6
ST5563-00 N/A Steel N/A 10 mm N/A 10 mm N/A 9 mm N/A M4X0.7
ST5564-00 N/A Steel N/A 13 mm N/A 13 mm N/A 11 mm N/A M5X0.8
ST5565-00 N/A Steel N/A 13 mm N/A 13 mm N/A 12 mm N/A M6X1
ST5566-00 N/A Steel N/A 19 mm N/A 19 mm N/A 16 mm N/A M8X1.25
Unit of Measure
1